Helobial type - endosperm, Biology

Assignment Help:

Helobial Type - Endosperm

This type of endosperm is intermediate between the nuclear and the cellular types. The division of the primary endosperm nucleus is followed by the formation of transverse wall that divides the embryo sac into two chambers-the micropylar and the chalazal. The micropylar chamber is larger and undergoes active nuclear divisions to form several free nuclei. The chalazal chamber is smaller and its nucleus may not divide or may undergo only a few divisions.

Later on wall formation normally takes places only in the micropylar chamber which forms the main endosperm. The chalazal chamber eventually becomes crushed and its nuclei disintegrated. According to Swamy and Parameshwaran, the formation of true Helobial endosperm is confined only to the monocotyledonous families. If it occurs in dicotyledonous families, it is only a modification of the cellular or nuclear type of endosperm. However, typical helobial type of endosperm has been observed in dicotyledonous families, such as Santalaceae and Saxifragaceae.


Related Discussions:- Helobial type - endosperm

Filariasis, F i l a r i a s i s Animal filariasis is an import...

F i l a r i a s i s Animal filariasis is an important helminthic infection caused by large number of parasites. In bovines, it is caused by setaria, stephanofilaria, p

Explain digestion and of digestive system of platyhelminthes, Q What are th...

Q What are the kinds of digestion and of digestive system of platyhelminthes? Flatworms have incomplete digestive systems and they present intracellular and extracellular compl

Respiration, what chemical is normally used to test for the presence of car...

what chemical is normally used to test for the presence of carbon dioxide

Bacillus thirungiensis, What are the genes responsible for the toxic substa...

What are the genes responsible for the toxic substance in bt?

Define the term probiotics, Normal 0 false false false ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

What is population growth rate, What is population growth rate? Populat...

What is population growth rate? Population growth rate (PGR) is the percent variation among the number of individuals in a population at two different times. Thus the populatio

What is the rh factor, What is the Rh factor? The RH factor is a protei...

What is the Rh factor? The RH factor is a protein of the red blood cell plasma membrane that behaves as antigen in blood transfusions triggering a humoral (antibody-based) immu

Respiration in fishes, RESPIR A TIO N IN FISHES - Respiratory org...

RESPIR A TIO N IN FISHES - Respiratory organs are gills. In elasmobranchi 5-7 pairs of gills present, spiracles present. In Teleostomai 4 pairs gills present, covered

St. jude medical valve--types of valves, St. Jude Medical Valve (SJM) :  ...

St. Jude Medical Valve (SJM) :  This is a low profile bi-leaflet valve, which was introduced in 1977. The leaflets and the housing are made of pyrolitic carbon. The currently

Mode of nutrition , What is the mode of nutrition in fish,human,amoeba,scor...

What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd